Originally Posted by
AnkleWork
Not tightened enough?
Originally Posted by
fietsbob
+1, get 2 proper headset wrenches ..
Are you sure the top nut is not bottoming out on the end of the fork steerer. ?
how much clearance is left ? [answer with measurements] if so get a thicker spacer..
Pretty sure there is not too much steerer. I tested this.
Originally Posted by
ThermionicScott
Are you tightening the top race and lock nut against each other?
The keyed cable stop is in between the top race and locknut.
Originally Posted by
FBinNY
Just a suspicion which you can confirm or rule out.
Swing the bars around, and see if the brake hanger hits the top tube before the handle bar does. If so, that's your problem.
When you handle the bike (not when riding) the front wheel swings around, bumping the hanger. This moves it a few degrees, then moves it back when it bumps in the other direction. The repeated bumping and small back and forth movement arc works the locknut loose.
The bars hit the top tube before the cable stop does. I also don't allow my bars to swing all the way like that when I'm handling the bike.